Nuptial Flight in Singapore is quite different from the rest of South East Asia. Etc, Camponotus fly around Aug to Dec, but yet I find them around May to June, but I can't find any of them now. As I said in the post of ID my queen, it depends on which part of Singapore you live in, different area has different species of queen you can find.

Singapore Ant Keeper
Keeper of Nylanderia sp., Camponotus albosparsus and Camponotus importunus.
Hopefully will be keeper of Carebara diversus
and soon to be keeper of Pheidole sp.